Muscovy's or Mule Ducks??? Im just not sure anymore

We bought these two ducklings from an acution last spring. They where labeled Muscovy ducklings. However the way the where colored, these two and the other one who died earlier this year, looks more like the Mule ducks. (Muscovy/ other duck crosses) Now that they are older though, the drake has more barnicals on his face then either of the two Muscovy Drakes we ever had, our lone Muscovy hen hangs with these two. I admit I wish they where Muscovys, I so look forward to them hatching out ducklings next year.

Here are a couple pictures I took the other day. The love to sit up high. Sometimes roosting on the tops of the rabbit cages.They don't really hang with the other ducks (call, Rouen, and Anacona ducks)

Let me know what you think. The Drakes name is Big Boy and the Duck is Little Miss, I know not very original.